* {
    margin: 0;
    padding: 0;
    list-style: none;
    box-sizing: border-box;
}

a {
    text-decoration: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

img {
    vertical-align: middle;
}

html {
    font-size: 50px;
}


/* 苏宁的rem倍数是等分为15份 , 它是按照设备尺寸除的,所以自己写的时候尺寸得*2*/

@media screen and (min-width: 320px) and (max-width: 359px) {
    html {
        font-size: 21.33333px;
    }
}

@media screen and (min-width: 360px) and (max-width: 374px) {
    html {
        font-size: 24px;
    }
}

@media screen and (min-width: 375px) and (max-width: 385px) {
    html {
        font-size: 25px;
    }
}

@media screen and (min-width: 386px) and (max-width: 392px) {
    html {
        font-size: 25.73333px;
    }
}

@media screen and (min-width: 393px) and (max-width: 400px) {
    html {
        font-size: 26.2px;
    }
}

@media screen and(min-width: 401px)and(max-width: 414px) {
    html {
        font-size: 26.7333px;
    }
}

@media screen and(min-width: 750px)and(max-width: 799px) {
    html {
        font-size: 50px;
    }
}